Exhaust HP Gains

[PERRIN_Jeff]

Originally Posted by MindtheGap

The K20 responds great to even just bolt ons. Now I dont expect this car to be as responsive, but we cant just assume it will get nothing

It does respond good. The few catback only results I found for the K20 show about the same HP as our catback made on the BRZ. So one could say the BRZ should really take to the same kind of easy bolt on gains.

Originally Posted by 86'd

I think the gains will be somewhere between the K20 and F20/F22.

And you're right, tuning is going to be a huge factor.

If we could only do some tuning now!

Originally Posted by Calum

The K20's head ports are HUGE right out of the box, and they flow really well. That why they can make so much power. I REALLY want someone to flowbench the FA20 heads.

Cosworth has one of these engines and according to them, there is lots of potential for this engine.

[Pekingduck]

The Toyota Rep for TRD said it suppose to get 9 HP from the intake and 4 hp from the exhaust with their products. It might be conservative numbers for the exhaust since they have noise pollution they have to control. Also I talk to their product manager at Toyota Corporate during the first 86 event and he said the motor very untap because they would have to change other things in the car and at the end drive up the cost of the car. I don't expect K20 HP gains from bolt on but I do expect to see a good amount. I want to see 200whp with I/H/E chip and some few other bolt on, but I might just be dreaming.

[Brian S]

Originally Posted by Fly Guy

Fujitsubo has some power and torque figures:

http://www.fujitsubo.co.jp/prods/det...04740/00001473

Well, from their testing, that torque dip was most likely due to excessive back pressure in the exhaust system for emission purposes. I just knew that had to be the reason for the dip based on the RPM range. Cat back exhaust with a minor tune will be the first thing I do to this car.

[blu_]

Originally Posted by Pekingduck

The Toyota Rep for TRD said it suppose to get 9 HP from the intake and 4 hp from the exhaust with their products.

Thats untuned and pretty sure the exhaust is an axle back, which means negligible gains if any.

[Fly Guy]

The TRD exhaust has gotta be a cat-back because the OEM pipe before the muffler isn't like this:

[dabocx]

Originally Posted by PERRIN_Jeff

It does respond good. The few catback only results I found for the K20 show about the same HP as our catback made on the BRZ. So one could say the BRZ should really take to the same kind of easy bolt on gains.


If we could only do some tuning now!


Cosworth has one of these engines and according to them, there is lots of potential for this engine.

O_o

I can sleep worry free now.

[Calum]

^^^What he said.

[Tad_07]

Originally Posted by Draco-REX

Cat back exhaust will do nearly nothing for power. They're purely for sound/looks and maybe weight if designed properly.

Headers will be where any exhaust gains are found.

Headers on a N/A will be the biggest again for hard parts (except for forced induction options down the road). I don't think there will be much gained on a BRZ/FRS though from the looks of the factory header. I'd be surprised if the entire exhaust gain more than 15whp.

[2fast4you]

Originally Posted by Fly Guy

The TRD exhaust has gotta be a cat-back because the OEM pipe before the muffler isn't like this:

Good catch!

[Gardus@Supersprint]

It' very difficult for just the exhaust to get you 15 whp..maybe at the crank.

I really can't wait to have the car here.

As there's a massive amount of cat and axle-back system being lunched I think we need to concentrate on headers and cats, and they need to be compatible with the stock catback, and all the aftermarket catbacks with it.

[PERRIN_Jeff]

Originally Posted by Brian S

Well, from their testing, that torque dip was most likely due to excessive back pressure in the exhaust system for emission purposes. I just knew that had to be the reason for the dip based on the RPM range. Cat back exhaust with a minor tune will be the first thing I do to this car.

Personally I think its there for two different power bands. The first power band is the normal driving type band where you are running from idle to just over 3000 and shifting. I think they reduced the TQ after 3000 is to help fuel economy for normal driving. Then you have the upper power band that perfectly plays into redline-ish shifting. As long as you are shifting at 7000, you won't hit that TQ dip. Very interesting way to help out emissions if you ask me.

[chulooz]

Originally Posted by Pekingduck

The Toyota Rep for TRD said it suppose to get 9 HP from the intake and 4 hp from the exhaust with their products. It might be conservative numbers for the exhaust since they have noise pollution they have to control. Also I talk to their product manager at Toyota Corporate during the first 86 event and he said the motor very untap because they would have to change other things in the car and at the end drive up the cost of the car. I don't expect K20 HP gains from bolt on but I do expect to see a good amount. I want to see 200whp with I/H/E chip and some few other bolt on, but I might just be dreaming.

*pinch* I'd be impressed by 175rwhp.

Losing weight(Ti) might be the better benefit over the actual power gained from an exhaust... and the sound.

[STJ]

Is there a chance to gain 30hp with a full straight pipe exhause, deleting all the cat's? And adding a mushroom filter to.

[chulooz]

Originally Posted by STJ

Is there a chance to gain 30hp with a full straight pipe exhause, deleting all the cat's? And adding a mushroom filter to.

In short, no.